:root{--bg: #0f0f12;--surface: #1a1b23;--surface-elevated: #23242e;--border: #2e3038;--text: #f0f0f2;--text-muted: #8a8c96;--accent: #6366f1;--accent-hover: #818cf8;--success: #22c55e;--danger: #ef4444;--radius: 16px;--radius-sm: 12px;--tap: 48px;--safe-top: env(safe-area-inset-top, 0);--safe-bottom: env(safe-area-inset-bottom, 0)}*,*:before,*:after{box-sizing:border-box}html{-webkit-tap-highlight-color:transparent;-webkit-text-size-adjust:100%}body{margin:0;min-height:100dvh;min-height:100vh;background:var(--bg);color:var(--text);font-family:DM Sans,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.5;overflow-x:hidden;padding:var(--safe-top) 0 var(--safe-bottom)}#root{min-height:100dvh;min-height:100vh}a{color:var(--accent);text-decoration:none}button{font:inherit;color:inherit;cursor:pointer;border:none;background:none}input,textarea{font:inherit;color:inherit}img{max-width:100%;height:auto;display:block}.page{min-height:100dvh;display:flex;flex-direction:column;padding:0 20px 24px;padding-bottom:calc(24px + var(--safe-bottom))}.header{display:flex;align-items:center;justify-content:space-between;min-height:var(--tap);padding:12px 0;margin-bottom:8px}.header-title{font-size:1.25rem;font-weight:700;letter-spacing:-.02em}.dropdown-wrap{display:inline-flex}.dropdown-menu{position:absolute;top:100%;right:0;margin-top:4px;min-width:160px;background:var(--surface-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);box-shadow:0 8px 24px #00000059;padding:4px 0;z-index:50}.dropdown-item{display:block;width:100%;padding:10px 16px;text-align:left;font-size:.9rem;color:var(--text);background:none;border:none;cursor:pointer;font-family:inherit}.dropdown-item:hover,.dropdown-item:focus-visible{background:var(--surface)}.share-feedback{position:fixed;bottom:80px;left:50%;transform:translate(-50%);margin:0;padding:10px 20px;background:var(--surface-elevated);border:1px solid var(--border);border-radius:var(--radius);font-size:.9rem;color:var(--text);z-index:100;box-shadow:0 4px 12px #0000004d}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:var(--tap);padding:0 20px;border-radius:var(--radius-sm);font-weight:600;transition:background .2s,transform .1s;-webkit-user-select:none;user-select:none}.btn:active{transform:scale(.98)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover,.btn-primary:focus-visible{background:var(--accent-hover)}.btn-ghost{color:var(--text-muted)}.btn-ghost:hover,.btn-ghost:focus-visible{color:var(--text);background:var(--surface-elevated)}.btn-icon{width:var(--tap);height:var(--tap);padding:0;border-radius:50%}.btn-icon-sm{width:22px;height:22px;min-width:22px;min-height:22px}.btn-danger{color:var(--danger)}.btn-danger:hover,.btn-danger:focus-visible{background:#ef444426}.btn-sm{padding:0 12px;min-height:36px;font-size:.9rem}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.deck-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.deck-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;min-height:var(--tap);transition:border-color .2s,background .2s;text-align:left}.deck-card:hover,.deck-card:focus-visible{border-color:var(--accent);background:var(--surface-elevated)}.deck-card-name{font-weight:600;font-size:1.1rem;margin:0 0 4px}.deck-card-meta{font-size:.875rem;color:var(--text-muted);margin:0}.flashcard-container{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;perspective:1200px;padding:16px 0}.flashcard{width:100%;max-width:360px;aspect-ratio:3/4;position:relative;transform-style:preserve-3d;cursor:pointer;border-radius:var(--radius);overflow:hidden;box-shadow:0 20px 40px #0006;transition:transform .4s ease}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-content{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:auto}.flashcard-back-inner{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px;transform:rotateY(180deg);box-sizing:border-box}.flashcard-label{position:absolute;top:12px;left:12px;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);z-index:1}.flashcard-text{font-size:1.25rem;line-height:1.5;text-align:center;margin:0;word-break:break-word}.flashcard-image{max-width:100%;max-height:180px;object-fit:contain;border-radius:var(--radius-sm);margin:8px 0}.flashcard-fullbleed-bg{position:absolute;top:0;right:0;bottom:0;left:0;background-size:cover;background-position:center;background-repeat:no-repeat;z-index:0}.flashcard-fullbleed-text-wrap{position:absolute;left:16px;right:16px;bottom:16px;padding:14px 18px;background:#0f0f12d1;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-radius:14px;border:1px solid rgba(255,255,255,.08);box-shadow:0 4px 24px #00000059;z-index:1}.flashcard-fullbleed-text{color:var(--text);margin:0;font-size:1.125rem;line-height:1.5;text-align:center;word-break:break-word}.play-controls{display:flex;align-items:center;justify-content:center;gap:16px;padding:20px 0;flex-shrink:0}.play-progress{font-size:.875rem;color:var(--text-muted);min-width:64px;text-align:center}.input-group{margin-bottom:20px}.input-group label{display:block;font-size:.875rem;font-weight:600;color:var(--text-muted);margin-bottom:8px}.input-group input,.input-group textarea{width:100%;padding:14px 16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text)}.input-group input:focus,.input-group textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #6366f133}.input-group textarea{min-height:100px;resize:vertical}.image-upload{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:120px;padding:16px;border:2px dashed var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--text-muted);font-size:.875rem;cursor:pointer;transition:border-color .2s,background .2s}.image-upload:hover,.image-upload:focus-within,.image-upload.dragover{border-color:var(--accent);background:var(--surface-elevated)}.image-upload input{position:absolute;opacity:0;width:0;height:0}.image-upload.has-image{padding:8px;min-height:auto}.image-upload img{max-height:140px;border-radius:var(--radius-sm)}.image-upload-remove{margin-top:8px;font-size:.8rem;color:var(--danger)}.card-list-editor{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.card-list-editor li{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px}.card-preview{display:flex;align-items:center;gap:12px;margin:0 0 8px;font-size:.9rem;color:var(--text-muted);min-height:44px}.card-preview-side{display:flex;align-items:center;gap:8px;flex:1;min-width:0}.card-preview-thumb{width:44px;height:44px;object-fit:cover;border-radius:var(--radius-sm);flex-shrink:0;background:var(--border)}.card-preview-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1;min-width:0}.card-preview-arrow{flex-shrink:0;color:var(--text-muted);opacity:.7}.card-list-editor .card-actions{display:flex;gap:8px;margin-top:8px}.empty-state{text-align:center;padding:48px 24px;color:var(--text-muted)}.empty-state p{margin:0 0 24px;font-size:1rem}.fab{position:fixed;right:20px;bottom:calc(24px + var(--safe-bottom));width:56px;height:56px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 20px #6366f180;transition:transform .2s,background .2s;z-index:10}.fab:hover,.fab:focus-visible{background:var(--accent-hover);transform:scale(1.05)}.fab:active{transform:scale(.98)}.fab svg{width:24px;height:24px}.back-link{display:inline-flex;align-items:center;gap:4px;min-height:var(--tap);padding:0 4px 0 0;color:var(--text-muted);font-weight:500}.back-link:hover,.back-link:focus-visible{color:var(--text)}.import-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:32px 24px;text-align:center;color:var(--text-muted);margin-bottom:24px;cursor:pointer;transition:border-color .2s,background .2s}.import-zone:hover,.import-zone.dragover{border-color:var(--accent);background:var(--surface)}.import-zone input{position:absolute;opacity:0;width:0;height:0}